As highlighted by The Air Current, regulations are set so that 737 MAX 9s with no more than 189 seats aboard the aircraft do not need the extra set of doors. Alaska Airlines, United, and other operators around the world fit into this category. On the other side, there are high-density configurations of the 737 MAX 9 which require that mid-exit door.

Article: https://simpleflying.com/aircraft-doo...

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